Steam boiler



Jan. 12, 1937; H, J. KERR ET AL 2,067,669

- STEAM BOILER V Original Filed May 13, 1929 3 Sheets-Sheet l wgzuINVENTORJ I ATTORNEYS Jan. 12, 19 37. H. J. KERR ET AL STEAM BOILEROriginal Filed May 15, 1929 3 Sheets-Sheet 2 3 INVENTORI ATTORNEXS H. J.KERR ET AL STEAM BOILER Jan. 12, 1937.

Original Filed May 15, 1929 s Sheets-Sheet a w wnw I W INVENTORSATTORNEYS Patented Jan. 12, 1937 UNITED STATES PATENT OFFICE Langvand,Barberton,

Ohio, assignors to The Babcock & Wilcox Company, Bayonne, N. 3., a

corporation of New Jersey Application May 13, 1929, Serial No. 362,516

Renewed 16 Claims.

This invention relates to the construction of water tube steam boilers,and more particularly to an improved supporting arrangement forauxiliary heating surface, such as a steam superheater, located abovethe main bank of steam generating tubes.

The invention will be understood from the description in connection withthe accompanying drawings in which Fig. l is a vertical section throughan illustrative embodiment of the invention; Fig. 2 is a section takenalong the line 2--2 of Fig. 1; Fig. 3 is a side view on an enlargedscale showing some of the details; Fig. 4 is a section along the line4-4 of Fig. 3; and Fig. 5 is a section along the line 5-5 of Fig. 3.

In the drawings, reference character I indicates a steam and water drumthat is connected by nipples 2 to downtake headers 3 that are connectedby a bank of inclined tubes 4 to uptake headers 5, which have theirupper ends connected to the steam space of the steam and Water drum l bymeans of the circulating tubes 5 that may enter the drum I along tworows of holes. A roof 1 is provided along the upper side of the upperrow of tubes 6. Rods 8 that are supported by means of supports 9 areconnected by means of the lugs in to uptake headers 5 for supporting thesame.

A plurality of tubes H preferably equally spaced extend from the steamspace of the steam and water drum l to the inlet header l2 of thesuperheater. These tubes pass through the roof 7 and extend for somedistance along the inside surface of the roof. A row of U-shapedsuperheater tubes I3, with one branch longer than the other, extendsfrom the header [2 and the short branches are connected by return bends14 with another row of U-tubes of the superheater. The return bends haveremovable plugs in the ends thereof for cleaning the tubes. The ends ofthe U-tubes opposite the bends in the U-tubes are all connected byreturn bends and a sufficient number of these tubes are provided to givethe desired amount of superheating surface. The uppermost row of U-tubes[3 each has one branch longer than the other, the longer branchesextending into the outlet header I5 from which a pipe l6 leads to asteam main. Rods I! supported by means 'of supports l8 are connected tothe outlet header 15 by means of the lugs I!) to support the same.

A bafiie 2| extends from the upper ends of the headers 5 along the upperrow of tubes 4 for a short distance beyond the header l2 to a crosssupport 22 that is supported upon a plurality of October 21, 1933 therows of inclined tubes 4. A baffle 23 through Which the return bends l4pass extends from the cross support 22 to the roof 1 and provides a deadgas space above the upper ends of the tubes 4 in which space thesuperheater headers l5 are located.

A row of tubes 24 extends from the steam space of the steam and waterdrum I for a short distance along the roof 7 and then downwardly into across box or header 25. by means of supports 27, with spring washers 2'1interposed when desired, are connected to the tubes 24 by means of lugs28 or otherwise to support the tubes 24 and thereby support the crossbox 25. A row of tubes 29 extends from the upper 15 ends of the headers3 to the lower side of the cross box 25 and a bafile 36 from the headers3 to the cross box 25 is supported upon the tubes 29. A baffle orsuperheater tube support 3i extends upwardly from the upper side of thecross box 25 and supports one end of the superheater tubes l3.

The support 3| is shown more in detail and on a larger scale in Figs. 3,4 and 5. It is shown as comprising vertical plates with holes 32 throughwhich the tubes l3 pass. welded in the holes, as indicated at 34, andthe edges of the plates at the upper ends may be attached by spotwelding, as indicated at 35. The lower ends of the plates 3i rest upon athick plate 36 lying along the upper side of the header 3O 25. Tile 3'!may be applied to both sides of the plates 3| and the tubes 24. Some ofthe U-tubes I3 are shorter than the others, having the loops- 38 thereofterminating on the left hand side of the support 3| to leave spaces atintervals be- 3 tween vertical rows of the tubes l3 through which spacesthe tubes 24 pass. The bent ends of the U-tubes which terminate short ofthe support 3i may be supported from other tubes by means of verticalplates 39 having semi-circular notches 40 40 along the edges thereof toaccommodate the tubes. The plates 39 may be spot welded to the U-tubesthat extend through the support 3|, as indicated at 4 l', and the upperends of the plates 39 may be attached to each ing, as shown at 42.

The gases pass from the furnace across the inclined tubes 4, thenceacross the superheater tubes l3 between the baflles 23 and 3i, thenceover the upper end of the baille 3| and out between the nipples 2 to astack, as indicated by the arrows. The superheater headers are shieldedfrom direct contact with the hot gases and the right hand end of thesuperheater, as shown in Fig. 1, is supported by tubes extending from I2and 5 Rods 25 supported 10 The tubes may be spot 2 other by spot weld-45 the steam and water drum I to a header below the superheater, thesetubes being supported outside of the boiler setting.

We claim:

1. In a boiler, a superheater, a cross header supporting one end of saidsuperheater, tubes supporting said header, and supports outside of theboiler setting for said tubes.

2. In combination, a bank of steam generating tubes extending across agas pass, a bank of superheater tubes adjacent the generating tubes, asuperheater tube support exposed to furnace gases, a cooling tube ingood conductive heat transfer relationship with the support, and meansinterposing the cooling tube in the circulation of the generating tubeswhereby some of the latter maintain the cooling tube filled with acooling fluid.

3. A steam boiler comprising a bank of steam generating tubes, a steamand water drum positioned above said tube bank, a fluid heater abovesaid'tube bank and at a level lower than said drum, a plurality of fluidconduit elements extending upwardly above said tube bank and connectedto said drum, means for supporting the end of said fluid heater adjacentsaid conduit elements from said conduit elements and independently ofsupport from the subjacent portion of said tube bank, and suspensionmeans external to said drum for supporting said conduit elernents.

l. A steam boiler comprising an inclined bank of steam generating tubes,a steam and water drum above said tube bank, a row of circulator tubesat each end of said tube bank arranged to connect opposite ends of saidsteam generating tubes to said drum, a fluid heater above said tube bankand at a level lower than said drum, a row of fluid conduit elementsconnected to and extending inwardly and upwardly from one end of saidsteam generating tubes and above said tube bank and having their upperends connected to said drum, means carried by said conduit elements forsupporting one end of said fluid heater, and suspension means externalto said drum for supporting said conduit elements.

5. A steam boiler comprising a horizontally inclined bank of steamgenerating tubes, uptake and downtake headers at the corresponding endsof said tube bank, a steam and water drum above said tube bank, a row ofvertical circulator tubes at each end of said tube bank arranged toconnect said uptake and downtake headers to said drum, a row of fluidconduit elements extending inwardly and upwardly from said downtakeheaders above said tube bank and having their upper ends connected tosaid drum, a bafile mounted on said conduit elements and dividing thespace between said rows of circulator tubes into a plurality of gaspasses, a fluid heater above said tube bank and comprising vertical rowsof tubes extending across one of said gas passes, means for supportingone end of said fluid heater tubes from said conduit elements, andsuspension means external to said drum for supporting said conduitelements.

6. A steam boiler comprising an inclined bank of steam generating tubes,a steam and water drum above said tube bank, a row of circulator tubesat each end of said tube bank arranged to connect opposite ends of saidsteam generating tubes to said drum, a row of fluid conduit elementsconnected to and extending inwardly and upwardly from one end of saidsteam generating tubes and above said tube bank and having their memesupper ends connected to said drum, a baii l mounted on said conduitelements and dividing the space between said rows of circulator tubesinto a plurality of gas passes, and suspension means external to saiddrum for supporting said conduit elements. v

7. A steam boiler comprising a horizontally inclined bank or steamgenerating tubes, uptake and downtake headers at the corresponding endsof said tube bank, a steam and water drum above said tube bank, a row ofvertical circulator tubes at each end of said tube bank arranged toconnect said uptake and downtake headers to said drum, a row of fluidconduit elements extending inwardly and upwardly from said downtakeheaders above said tube bank and having their upper ends connected tosaid drum, a bafile mounted on said conduit elements and dividing thespace between said rows of circulator tubes into a plurality of gaspasses, and suspension means external to said drum for supporting saidconduit elements.

8. A steam generator comprising a setting, a bank of inclined steamgenerating tubes located in said setting, a steam and water drumdirectly above and extending transversely of one end of said tube bank,water chambers connected to the ends of said tube bank, a plurality ofwater tubes connected to one end of said tube bank and extendingupwardly in an inclined direction for a portion of their length andhaving their upper ends connected to said steam and water drum,suspension means external to said steam and water drum for supportingsaid water tubes, means including said water tubes defining a pluralityof serially connected passes for the flow of combustion gases leavingsaid tube bank, said passes being confined to the space in said settingabove said tube bank, and a group of steam heating tubes in the first ofsaid passes to be traversed by the combustion gases.

9. A steam generator comprising a setting, a bank of inclined steamgenerating tubes within said setting, a steam and water drum extendingtransversely of and directly above the lower end of said tube bank andconnected to the upper end of said tube bank, a row of water tubesextending upwardly intermediate the ends of said tube bank and connectedto said drum, Suspension means external to said drum for supporting saidrow of tubes, and a vertically extending baffle supported on said row oftubes andarranged to separate a plurality of gas passes above said tubebank. I

10. In a steam boiler a circulation system including a steam and waterdrum and a bank of inclined steam generating tubes connected thereto, abank of return bend fluid heating tubes above said generating bank, andmeans for supporting said fluid heating tube bank comprising verticallyextending tubes arranged adjacent said fluid heating tube bank,suspension means external to said drum for supporting said verticallyextending tubes, a header extending transversely of said fluid heatingtube bank and connected to and supported by said vertically extendingtubes, and means for connecting said vertically extending tubes andheader into the boiler circulation system. i

11. A steam boiler comprising a bank of inclined steam generating tubes,a steamand water drum above said tube bank, supporting conduitsconnecting one end of said tube bank to said drum, a group of returnbend superheater tubes above said tube bank and at a level below andreceiving steam from said drum, and means for supporting the end of saidsuperheater tubes adjacent said supporting conduits from said supportingconduits and independently of support from the subjacent portion of saidtube bank.

12. A steam generator comprising a setting, a bank of inclined steamgenerating tubes within said setting, uptake and downtake headers at thecorresponding ends of said tube bank, a steam and water drum extendingtransversely of said tube bank and directly above the downtake endthereof, a row of tubes extending upwardly intermediate the ends of andabove said tube bank, suspension means external to said drum forsupporting said row of tubes, a vertical baflie supported on said row oftubes and arranged to separate a plurality of gas passes above said tubebank, an auxiliary fluid heater extending across one of said gas passesabove said tube bank, and means for supporting said auxiliary fluidheater from said row of tubes.

13. A steam boiler comprising an inclined bank of steam generatingtubes, a steam and water drum positioned above said tube bank, a baflieextending vertically from said tube, bank and defining one side of aheating gas pass above said tube bank, a steam superheater above saidtube bank and including a bank of return bend tubes in said gas passhaving opposite ends extending through said bafiie, and means forsupporting the other end of said superheater tube bank independently ofsupport from the subjacent portion of said steam generating tube bankcomprising a row of vertically extending tubes connecting one end ofsaid steam generating tube bank to said drum and supporting said otherend of said superheater tube bank.

14. A steam boiler comprising a bank of steam generating tubes, a steamand water drum above said tube bank, fluid conduit elements connectingone end of said tube bank to said drum, and a fluid heater above saidtube bank comprising a group of return bend fluid heating tubes havingtheir end portions adjacent said fluid conduit elements supported bysaid fluid conduit elements independently of the subjacent portion ofsaid tube bank.

15. A steam boiler comprising a bank of steam generating tubes, a steamand water drum arranged above said tube bank, groups of circulator tubesarranged to connect the opposite ends of said tube bank to said drum, agroup of supporting tubes extending upwardly above said tube bank andintermediate said groups of circulator tubes and having their upper endsconnected to said drum, and a fluid heater arranged above said tube bankand supported by said supporting tubes.

16. A steam boiler comprising a bank of steam generating tubes, a steamand water drum arranged above said tube bank, groups of circulator tubesarranged to connect the opposite ends of said tube bank to said drum, agroup of supporting tubes extending upwardly above an intermediateportion of said tube bank and having their upper ends connected to saiddrum, and a fluid heater arranged above said tube bank and having oneend thereof supported by said supporting tubes independently of thesubjacent portion of said tube bank.

HOWARD J. KERR. IVAR L. LANGVAND.

